The NMCA is proud to announce that E3 Spark Plugs will be returning as the presenting sponsor of the NMCA Muscle Car Nationals in 2018, continuing the sponsorship the Ponte Vedra, Florida company began last year in 2016. E3 Spark Plugs, manufactures spark plugs featuring a DiamondFire ground electrode was developed as a better way to ignite the fuel-air mixture inside the engine's cylinder. E3 Spark plugs can be found on many top competitors in the NMCA.